Guys - why point out flaws in your girlfriend?

when we are together.. he will point out flaws.. its really hurtful.. then he'll have sex with me and be affectionate.. afterward nothing and on top of that he'll kinda get upset with me saying stuff like why don't you have any confidence?! or just bluntly No confidence!? But how does he expect me to be confident when he just points out flaws all the time. Why be so mean and hurtful to your gf?
Guys - why point out flaws in your girlfriend?
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